Question about RCA P52937 52" Rear Projection Television

No power when the TV is plugged in the only thing that happens is a chirping noise coming from the pack of the TV. The noise seems to come from a transformer although I suppose the problem could be the HV Block since that seems to be the big proble area for these TV's.

Jeff Murray Jul 08, 2007

It doesn't make a sqeeling noise it chirps, just a small chirp then a pause then a chirp and it continues to do this for as long as it is plugged in. It is a CTC195M26B Chassis, at least that is what is what the label says. The model is a P52937YX2, Do you still think it is the Flyback and and output transistor?
Anonymous Mar 29, 2008

rca p52937 52in rca p52937 52in

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Anonymous

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Simalar problem on my 58 inch it was the transformer.ran me three hundred at tv clinc parts a labor

Posted on Apr 13, 2008

Mike Longo

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398 Answers

The P52937 uses the PTK195 series chassis. If the TV makes a squeeling noise the instant it is plugged in then unplug it immediately and do not plug it back in. I have seen this many, many times. The flyback (high voltage) transformer has shorted out and the extra current it was drawing has shorted out the horizontal output transistor, so the B+ supply is dead shorted and the power supply squeels as a result. This is very common in that chassis. The flyback and output transistor will have to be replaced by someone with experience in RCA projection TV's. The HV block in the PTK169 sets is the one known to be bad a lot - the block in the 195 is very reliable and I have never seen one of those bad.

Posted on Jul 06, 2007

Mike Longo Jul 10, 2007

It could still be the flyback but it probably does not have a shorted transistor. This actually depends on whether the chirp is coming from the flyback transformer or from the switching power supply transformer. I would first need to determine if the main B+ from the power supply is always up and running or if it going up and down with the chirp sound. This does sound like one of the more complicated problems with that chassis, so the set should be looked at by someone experienced with the RCA 195 chassis.

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